<p><strong>URL:</strong><br />{{ url }}<br/><span class="howto">http://www.url.of.the.site.com</span></p>
<p><strong>Target:</strong><br />{{ target }}</p>
<p><strong>Image:</strong><br />{{ img }}<br /><span class="howto">/wp-content/uploads/.../yourimage</span></p>
<p><strong>Alternative text:</strong><br />{{ alt }}<br /><span class="howto">Optional</span></p>
<p><strong>Alternative title:</strong><br />{{ title }}<br /><span class="howto">Optional</span></p>
<p>
  <strong>Width:</strong> {{ width }}px
  <strong style="margin-left:1em;">Height:</strong> {{ height }}px
</p>